It is also called as surface loading rate or surface over flow rate. The volume of water applied per unit time per unit horizontal surface area is called over flow velocity. To design Sedimentation tank following elements are required in the consideration: Similarly when diameter of the particle is more than 0.1 mm then it is considered as turbulent flow then equation for settling velocity is We know specific gravity of particle and unit weight Hence for laminar flow equation for settling velocity of the particle after substituting drag coefficient is If diameter of the particle is less than 0.1 mm then it is considered as laminar flow. The settling velocity of the particle " V s " is calculated by Stoke’s law which was obtained fromĬ d = drag coefficient and it is obtained by knowing the Reynolds’s number (R) The amount of suspended particles collected at bottom of the tank is based on different factors like shape and size of tank, size of particle, temperature of water, flow velocity, detention period etc. The velocity with which the particle is settling is known settling velocity. ![]() The main principle involved in the sedimentation tank is to reduce the flow velocity of water which allows the major amount of suspended particles to settle down. Working Principle of Sedimentation Tank.
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